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Both plants and animals exchange carbon with their environment until they die.

Afterward, the amount of the radioactive isotope carbon-14 in their remains decreases.

Before more precise absolute dating tools were possible, researchers used a variety of comparative approaches called relative dating.

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Whenever possible, researchers use one or more absolute dating methods, which provide an age for the actual fossil or artifact.Sometimes only one method is possible, reducing the confidence researchers have in the results. “They’re based on ‘it’s that old because I say so,’ a popular approach by some of my older colleagues,” says Shea, laughing, “though I find I like it myself as I get more gray hair.” Kidding aside, dating a find is crucial for understanding its significance and relation to other fossils or artifacts.